Roof.



F. C. OVERBURY.

Hoor.

APPLICATION FILED IAN. I9, I9I`5.

' 4Patlifed Jan. 4, 1916.

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amar orales.

'FREDERIGK c. ovsniaomr. os MoN'rcLaIis, NEW JERSEY.

Roon.

Application iiie'd 'January i9, i915. serial no. 3,048.

To all automy it may concern: A

lie it known .that I, FREDERICK C. OVER- iii'ln'ga citizen o`t the United States, and a ,resident oft' h/lont'clair,

Essex and-State of New Jersey, have n- `rented certain new and useful Improvements in Roofs, of which the following is a specification. v-

This invention liasrelation to roofstruc- `tures `and more particularly to lthose involving the use ot prepared roofing papers and fabi-ics either in the form of sheets yor shilngles. a

n-the ordinary building, wheriiilnepared roofing; material is used, the rooic comprises the usual timbers upon which are secured wooden' boards toseri'e asa structure or base for thc'recveption of rooting, material. These' boards contain usually more or less resinf'ius matter, and, on tlieotlier liand,a re absorbent, particularly after they become dry. Ordinarily the prepared roofing con of a sheet or foundation of-felt or other like fibrous material which is saturatedor impregnated with a low melting point asphalt or hydrocarbon compound containiiiii more or less oil. On the saturated toundation is usually a layer ot' relatively harder pitch or asphalt.' in which, in some instances, is embedded a layer ot' crushed mineral such asy slate, gainite or` the like for improving'L the waterproof and iiijeproot' qualities ot the roofing.

During' the slimmer, in some localities in this coi'intry, and during the greater part of the year in the Southern States, the heat of the sim greatly sottens'the impregnating compound of the roofing and tends to permit the separation and How of the contained oils; so that, when the roofing is laid upon wooden boards as I have described, the o'il is gradually to a greater or less extent ab, sorbcd by the wooden supporting structure and produces two results iirst, iti detracts from the durability andwaterproof quali ties oiA the foundation, and, second, it renders the boards more-highly inflammable. I have seen instances where the roofing boards, `under the conditions stated, have become black with thel absorbed oils and highly intlamiiiabie. When, on the other` or to the 'presence ot" tire brands dropping Speciiea'tomn of Letters Patent.

in the county of' Patented Jan. 4, 1916 materially softened, and the absorption by the wooden structure of the contained oils is greatlyincreased. In an ger from fire is increased. gain, when the resinous content ot' the wood works to the siii-'face an'd makes contact with the impregnated fabric, it is, asis well known, de-

'structive of the integrity of the fabric, Anyone familiar with the conditions which appertain to the use of prepared roofing has seen the damage done to prepared' roofing` material by the resinous matterwhich collects upon ory oozes from the roofinff boards'on which such roofing is usuallylaiiv c My invention has for its object remedy@ ing the evils incident to such roof structures asl have described, and moreover to safeguard such structures againstdestruction by iire, and `this is accomplished accordiup` to my invention by providingg"- between the wooden support and the prepared roofingr a. layer of such substances as will be ati'ecvted neither by tlieresinous content of the wooden support nor by the oily content' oi' the prepared rooting,A and, preferably, it will he fire resist-ant. Various substances for this purpose may be used,- but, for the sake ot' cheapness and easel of application, l prefer some. fluid or plastic material which may be applied by a brush or other implenient, such tor example as sodium silicate. Such substance may be applied to the wooden support before the rooting material is laid case, the dan; i

thereon, and it may be. ,permitted to harden before. the rootingr material is positioned, or such rooting material may be laid while the substance is soit and plastic, so that, When the latter li'ardens, it serves in assisting to -sccure the roofing material in place. 'It is "between the absorbent boards and the oily or hydrocnrbonnceoiis matter containedin the impregnated foundation of the roofing .'material.,y hand, the root' is eiqios'edl to heat, ashlee` cause oi its-proximity to a, burningbuilding Y 0n the accompanying drawing, Figure 41 .represents a section through va .roof 'embodying the invention and in which the pre` pared rooting is in the form of sheets. Fig.

2 represent-s a.I portion lof a roof in ai'hich A the prepared roofing is 'in the form of shingles. Y

n the drawing, 10, 10 indicate the usual timbers which form a portion of the roof structure,` and 11, 11 indicate theordinary wooden boards, which are nailed thereon to support the prepared rooting material. According to my invention, Yafter the supporting structure has been erected, the boards are covered with an impermeable lave'l of' sodium silicate (either alonej or n'ith other substances added thereto) or other equivalent fire resistant material which is notacted upon by resinous matter contained Vin the boards, or by the asphalt, oil or other compound used in saturating or impregnating; This layer may be applied b v any suitable means, and, if desired, permitted to lportion of the surface thereof, and the pre- ,y pared roofing cutiinto the shape of shingles or tiles 14, e. laid on the layer. The roofing material in each instance is preferably made of wool felt or its equivalent fibrous material impregnated with a low melting point hydrocarbon such as asphalt, and coated on one or both of its faces with a harder pitch or asphalt. On the upper or outer faces the prepared rooting elements l may have mineral pigment mixed with the pitchflike coating, or crushed mineral may be embedded therein.

Having thus explained the nature of my said invention, and described a way of making and using the same, although WithoutI attempting to set forth all of the forms in which it may be made or all of the modes of its use, what I claim is A,

In a roofstructure, vthe combination with the roof boards, and an outer covering of prepared,rooting vmaterial consisting ofv a fibrous foundation impregnated or coated with a waterproofing hydrocarbon compound, of an interposed coating of a fire resistant substanceV which is impermeable to and not affected by the resinous content of the boards or by the said inipregnating compound, substantially as set forth.

In testimony whereof I have aliixed my signature in presence of two witnesses.

FREDERICK C. OVERBURY.

Witnesses PETER Summen, BENJAMIN IIaR'rMAN. 

